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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f307c351368e8ef13eb01018e033ddd588536f03d6165603b1b0104d33d3bb2' 
  AND token = 'tyh7IDjdcVIrMgm4bnMY/JrxIw8g3G+KHyACHZW38E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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