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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55a4dd3bb24267b832227e1f00e9a31d740e23603a4a37ff90f83ba8ec77806c' 
  AND token = 'YOohxI6JKcTc7OYtaV24t8I6BthS5gekYH8NqmpJugc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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