SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8c00a34e1f0e9ac59bf795c4f4b9b224396cbbd5cd27a99ee99cb3b3f91ba23' 
  AND token = 'kvVYmLmDL29QbxXviZhFqnI0PyxKztCCGos1zO/HaIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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