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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96d734884557e3aa5d164427119cc2776425e54d103339ce0543e4ab965fac79' 
  AND token = 'v1ZCFrHFRq0xcamkkGjuG29UHhSoEmeKkYSm7faL4cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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