SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be4285c28995a809ac3a6b018ec5e983c7fc4a96857d1c39643689b6603ad91c' 
  AND token = '2PvvwZXlZUFhU95dGVz82ZOH8bExg7V/kWTa5hCkFnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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