Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff06d50b334348c527d1d24b38e1ac9e039ccecaf9a536862c53ccd0368aa19f' 
  AND token = 'J9tSl4PzdegWhuu7ujF6A7vDkqziWt2iw4j366IsQ/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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