SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adeed62c8f39c0b28f7e68c9bfc5f41932c14204fcd7c0e79f638307a5fa9858' 
  AND token = 'HnP7OvOqz6IMemoycR6+GHoQK/B4fwhpeYRhQxh+3go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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