Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc8073d4312406507419393ae678d505fd36762441aa610053d744896bf6550b' 
  AND token = 'S3KmaiD9+ADpOYqYWzpR1fTDK92lUz9y/dP4j1yOd1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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