SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cd32c55b9b32e8358191c3b9e538e2ea95a2a4504fbfad35c761f47d1780bd9' 
  AND token = '8qRWN/yN9PEzMA5HxQ0EjvZgHWmyV2Qf7Kpd6pfKgDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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