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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf68e30f5b3d0f079fe3e5b3901bb19591340bf216ef2e8cf0dbceaa8b1df12b' 
  AND token = 'apw+OL5/Y0FPRKAhh18MJV6cdhGCThvt7oUhKbi7NIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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