SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5e813d00cdc804ea4fa118c8180a4666a0f9a55588abbafa6309795549f6f3c' 
  AND token = 'lNuUU+/GYeDWJ1bY64zphT2NO9OuRR0/KPxXiBIwj1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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