SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3835e6e48a9d1a99c1e4a635bce1dbd8189769df9566672a68dc3ba42266bcf' 
  AND token = 'Z2hYzkEEX3TPyZ0TkFT2H/NXYNhqGoPsUZ30KWv/Zog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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