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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b40098cadfbb959bb151463c75ba6593cfdbfec4c9d12b62443671524f04172a' 
  AND token = 'ErA3v+oXLyFFvFn4bbGOU4tuiWh8XTm/kh/2y4aZvWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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