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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbffeabdc85d33fb5c9297a5992287ba248a3fac701fb6da868abfbe8e9dc8fc' 
  AND token = 'fIQrRuGe2cMwHUi0DSOeBr5OwRSQbyGa1AMD6zdSbHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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