SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1511eb3644d8f9d0e2c968a8010ee9ae3596c435f5f7ca7c9955802549c7a6bb' 
  AND token = '24NwzdyO2Xq1gOFIgw9QgrLKHmOMgFgH+jA3g6nuthw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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