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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17bf8c43c52f6bfb25ac39e68ed4fea3a4d8f0d2cbf49ada022655fa908ba645' 
  AND token = 'rwzBtFdFIYU5A9t0WXn4IcbECmn1tLmCsF/GzNVneVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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