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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c58da2f540df5f4934a7d98500fef2d553d932afe1e46d3170ad8b7513196ccb' 
  AND token = '9JpAjvGtfaXAzX7RRx3dAj2A4BxovP/5fIAMz6N2AL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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