SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c970fb61263c5812ceb8eba66f66e003332f0b9a1a0939999d87be661705b899' 
  AND token = 'GZOftu79x0u9/ZzU04ztyMd42IvCmhvuiKC4/s+w6go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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