SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8181a26c69b0f85a1e9818f9023c91a5cd29a4aad7842382d94e6432c425fac6' 
  AND token = 'LiBIbGKrkP/1lI6nYzw5v777XHmY5J6fhkNKh2dtnr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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