Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5856d4f5a90a0351e104c537093ecc954da9fa57aaefbdcfdad17308f0ffdf23' 
  AND token = 'Hsmv7pECiG1KALRJh4XL6JS+2ervBJ69hKwQfzFp63E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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