Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f4d8355ff6c1fdd88b5c0bfdc71bc2ffe7c6bad28e079614e16dcfe247d7974' 
  AND token = 'NN8YOvggPEzKCcCRZYS/LdSOeTCorRq10AHOoWtAmIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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