SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f0ff9db7980a2a950f38c2910babf7fca56d4ae0869cb748e40afae695368de' 
  AND token = 'wHAXSG//2qcYLkT3XrVPPsjtb0+zexhz9JVc3Si6y4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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