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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ad5cde82f486e9480dfbfd5a7502cc4570d001c9da0eacf275da9df1fb71f2f' 
  AND token = '2khckEyugWFGRB+vwfe/FHutJkp+BuA49S2Xc4K9FcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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