SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1984c34e0fd378fabd36cbc6825fbb1538cd94a4bba70e2e2285500e1e51e50b' 
  AND token = 'HV2u/QMnaxE3QX9wNZ9h6hLLwRypdFZz266FZ+GW13k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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