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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97de1f4e54dcd081b959c8141b5ae5939e51896fb4b54a5c50fff2804148e688' 
  AND token = '1nqNILrJXg5oYJKfHyUprIE5SCBF55PFWFF7xKjSFx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}