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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '958a946739bdc2e3cc8d97fc1d107c8fc424fa57f6e97ab0a1710bcdd22caff4' 
  AND token = 'SObvg3RJ9iQiNbQ5QLM7Uxs8FPYQtiVloZyM4RudXQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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