SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10f34a9f416ceb962d45fe7e9ac39af8a45a0648595ba7db87fc0adeb039cc57' 
  AND token = 'wVZbJ5x/mnFWW3FfhudB8Y3+B09d5pK/Wh36AzxSwE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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