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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e708e462473b0726edd169adc88a58d5211e5c9a1a1b49c76f66a12a8447bce9' 
  AND token = 'qUMqNEhYLJYq7S4e+jwXrxTRAAoHaocXxBwU5axQIZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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