SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abf10ebe67f6b5d3627cb9dcc19cfa7f8a0d6f8c0343e22ea59763bcedb14f6f' 
  AND token = 'GUlRJynChEz2q+7jBus5Xodjs/3Brop00tThjFxR/q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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