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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de7f8ed8d9c06ce993df344261444e219e1d5abce0f1253f524fdf56744a7ad0' 
  AND token = 'O38vxrSFlv0AO2PCIpJat7iiENjbBX2aEMOnOd5nZeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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