Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be62b0caebed79d1eee2ac6be31bcfd9bbbab1740fc221336e2addf3bbafbfdd' 
  AND token = 'QVTu+3JzpSVLAhJUS8Ozj4obE3YGHH/F28YS4rWySBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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