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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1304d3b01247fd72e081863c267cf512ab67ad1daba6f34bf886b2deb8c89a20' 
  AND token = 'c4A4UGVtfIOU5Vepw8d6GwO4h4AzNJI+7jtYCdpRiz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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