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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb14daf45c524aef7654abba7d8c225118c5b8d1984e234f7f3d99e811816924' 
  AND token = 'BSXJc0hecLjINdtwT9YOYw3LaJE3kb9D3Hzi+ibgxz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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