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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0fbba23485213c4d8758da063febbfabe1ce9afcaa79473c65f508c6b7afdf6' 
  AND token = 'Tn9SztlUwuba8ms0OwmWaXDfHZb4HKGpTtoT5/hpviw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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