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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17138fe79e6bdeaa6c7b95bf17bd363ee748f9b1cc2ee25dfce6c602d48dc98d' 
  AND token = 'tznWI/4gDGMb4kdU21gpoA4kguCZuRGHPwCGRvu3hRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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