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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd0f95e8e855eb78b4af4aeba3006aa8c8b6ab74a3d83b6473614488db94e428' 
  AND token = 'pVfu9FqeXaHiOFkEdZK7qe18IYFdZqZLWELKhJZhDEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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