SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '816598a95698cd9f74f997f6abb36d341a2bf082b54c261a32abbf2be0eb3ef5' 
  AND token = 'DUU7qTq3m7g2bQ4BM3XFSESS7uX7muBPKhO5wkZldnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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