Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '657b4dda8eef9c5f47544833cf7348681646de48081dad47fae3364b11a3428c' 
  AND token = 'oVoK2XXC09cjKNng2XyZy7ayvTi87dmvixrHBgAIk44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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