SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a016ea762d57a37549ee835151a64f8f6be97460aa5a309a7be5d53f2d9e60bc' 
  AND token = 'ROr5vNVamw0UfyzPK/kcZYumrMPhicTWLTaFDxgJmj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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