SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd9830407139d844f165bcba8b88b746224a8e1bbfcae1237321c674420ec68c' 
  AND token = 'DLJKdPSZVOdjTsjpCwCD+VFbgvZptDvE7G4cneUq0ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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