SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5007f862dec9a4fbc319e46e4a4b53190d006f42d64796da2371a54d28d9f8d7' 
  AND token = 'l4WBE/l9pIt6XBRgfPTW9xzuxvt27eGvsXkyV9FntKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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