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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76034e2c6899bd33c13e5caff025d8e766d74d9b5fafb04f7307f5e7bf10e6a7' 
  AND token = '3KGcJiTw1zy/CDLNHb9eJlUdt1uv2kO338P8kEOWykk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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