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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '057a9f701957c69e45552ae536fda3fd7e5aaec04fccf1db8f4834382cc7bb96' 
  AND token = 'Z/tmcbOJ8rfxT9F8fkLUl0PI55D9swblUrP595s6TsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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