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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6f630136dd7e10e6254e820014f4e4c9a14c140fd26175c3aa5031f5e81e2f2' 
  AND token = 'OTH4zgl1P+9F7KsN0jlcu88/RF2gA5QfjP+z4OK7bCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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