SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c113eacacc0d704c9a49515cc4ca391d954e01df89645b5f6bbbff9dac8faa32' 
  AND token = '9W/ixJMHxBRywphWoksWgvQ/mZBG778CVoqZY1FqGFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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