Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5504ac2350832b53e8487c79d57297d8ea2cc4887d0667b32c80a2a1cbb4515a' 
  AND token = 'FMeLWimeyAMON/pXSDYS6NuWvXbfsPJefOyj54qDtjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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