SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '707504359cf592d712ad501b842e024af7910262e9652c6ac8e03139f65e00dd' 
  AND token = 'xnGHzS8lAgCbjIOfQN/uR1+Qts+ML85ZYJw7jRzyhJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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