SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '854d168390caf542d78343845b0e52c8bba5910c90fd398ad7056e9c053e3bce' 
  AND token = 'YPBEU9mv1BbPnZ9UtwCQhwqo6N/kL4x+nL9pPU6IsNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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