Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2c5aa2ecf5b8f7babd0e5e32ec209b5e4a5d934b776309b882b0c90e8c41c31' 
  AND token = 'l0+xYI++UzQ9NORLE3GpQ7bUdiRdo9AVJp6JWavzXjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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