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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf5ebef16da8de44b3104bca3cc49fca48cb12c98be1ccb6da2ecaa01bf6872a' 
  AND token = 'mitwuNVQe43pjhcwieQrliV1mHmQ0R2BRdB3HokmaU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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