SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '881da077f790ce8941ebc9045485f64f5387d08c935da245904c5408ffa8ba94' 
  AND token = 'LKYVapK/+Acdvx4tqeiKXsRfAa2ND6GV3DQWJ/966+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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