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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d33672ead003ed232ec6f60d3790a899c884553f873289f275f14a223485a87' 
  AND token = 'WhNQ8YtCXUj7HTXPD77/jV174DcDo5NuD3BvAI+NWVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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