SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ce0c310fab540d88cffaf97a0bbf90cc8c49433f6d391596ed02d3b7d4f07d7' 
  AND token = 'STbtKj/HrHBhBw2CIkWl/1gQ0HMzyYkJ9hBuYYGLj1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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