Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fb827377b2e149ddf5c1fdcbbbf0c4d3d8e2f85afa24ada7c9265afdd651d75' 
  AND token = 'Qt+FTGt08wtT/nPBvMTKGu8a4o7dyI5C9FSFYt34+Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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