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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '624548ec88e0c7c6f84b750bbc53584a5b082f122608fe6f9eae92b31d098a56' 
  AND token = 'tlg52AE35n9z/LZ7H6vpNbBLz/XDg+kr0vZlg2IA+oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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