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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0c25256acc4b27202b5c2184ba2f08452269aaf565807527ef9ad3d73f220e7' 
  AND token = 'rb7a37rlKh+xWsAS9EmgBhs0r+NO3rekLmEaV1J2Els=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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