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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b37595bd78508104f40bd70374d0ee82b91ebbdfd763bd09d4e80edabe44d21' 
  AND token = '4iSW5rZYi3pYU6r740QcThia8raBxUAPRzF/ECtYjNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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