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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cc74b2c56be6f4f02944a4abbfd944552c1117c14294fcd84852e401247a906' 
  AND token = 'KDAtfiUa1d0e/4/xVMOv6vlctwK+VYkdeYryiVJBG64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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