SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2b6157ceb29de4f30cb85ca392a5c4bed082461fca780103abac49e81ab5ff9' 
  AND token = '7l6B8gFUjupv3rx4l5YvZv/kXzdh0+4BvINDAfnpBWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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