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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aecabd9faebf5cb7dc9c85ec32581dfbf60ab21d4f6a91229c085a1b53c74cf0' 
  AND token = 'BbdEoweIZPn2ZW2nxaPzJRVIJO8tu1hTkSekddQ8lTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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