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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0407c470d248d0d6fd9020fecfb998dbab68c24a024e0685955bf52b7a6f7b26' 
  AND token = 'y9IFu7laQR0ybeqy0GD+sw5tvDWnqLdFzgWg4R1YOlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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